Ideal for drilling in heavy-duty tough metal, including hard abrasive alloy metal, hardened stainless steel or cast iron.

Made from industrial grade M35 high-speed steel with 5% cobalt provides hardness for wear resistance, withstands max 1100 degreeF. Includes 21 drill bit sizes 1/16-inch to 3/8-inch in 1/64-inch increments and metal index case with size chart for easy bit access and identification.